Disallow unnecessary escape usage (no-useless-escape)
Escaping non-special characters in strings and regular expressions doesn’t have any effects on results, as in the following example:
let foo = "hol\a"; // > foo = "hola"
let bar = /\:/ // same functionality with /:/
Rule Details
This rule flags escapes that can be safely removed without changing behavior.
The following patterns are considered problems:
/*eslint no-useless-escape: "error"*/
"\'";
'\"';
"\#";
"\e";
/\!/;
/\@/;
The following patterns are not considered problems:
/*eslint no-useless-escape: "error"*/
"\"";
'\'';
"\x12";
"\u00a9";
"\371";
"xs\u2111";
/\\/g;
/\t/g;
/\\w\\$\\*\\^\\./;
When Not To Use It
If you don’t want to be notified about unnecessary escapes, you can safely disable this rule.
Version
This rule was introduced in ESLint 2.5.0.